Voice output does not work
The voice output is not part of Sportractive, it’s a separate app. On most mobile phones the Google-Text-to-Speech app is already installed. You can check in the Android Settings if this is also the case on your phone. Select Languages and Input then Text to Speech Output. Now a list of Voice Output Apps are shown. If there isn't at least one App shown you can install Google-Text-to-Speech via Google Play.